Evlution Nutrition L-Leucine 2000 is a branched chain amino acid considered key to building and maintaining muscle through promoting muscle protein synthesis. L-Leucine plays an important role in boosting activity, which is the process of building muscle and tissues, and since the body cannot make it, it must be consumed through food or supplements. It's also important to your performance, helping to prevent muscle breakdown during exercise and promote repair and recovery after exercise. Evlution Nutrition L-Leucine 2000 sources the purest form of Leucine to support muscle building, endurance and recovery while you train and throughout your day. L-Leucine is the most important of the 3 branched chained amino acids for initiating muscle protein synthesis which is necessary for muscle building and helps preserve when you exercise or when your body becomes catabolic from dieting. Choose L-Leucine 2000 to boost muscle protein synthesis and your daily performance.